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what about a phishing attack that involves the attacker talking the target through a login, which also involves the u2f part? and then obtaining the session token from memory/disk instead of username/password

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How would the attacker get something from memory or disk? Malware? If there's malware involved I don't consider that credential phishing. It's a matter of debate whether malware can be considered a form of phishing. Maybe I should be been more clear that U2F stops credential phishing, not malware phishing (if that even exists).

I guess one option would be to ask the victim to read out the token from memory or disk. That seems pretty hard though. It's debatable whether that would be considered credential phishing.

A more likely method would be to trick someone into going into devtools and copy and pasting something from there, possibly a curl command, like in this epic "bug report"[1]. That's also debatable whether it would be credential phishing.

[1] https://hackerone.com/reports/745324

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